CYPRESS SEMICONDUCTOR CORPORATION
                                    FX3 SDK

USB ISOLOOP-AUTO EXAMPLE
-------------------------

  This example illustrates the use of the FX3 firmware APIs to implement
  a data loopback application over a pair of USB isochronous endpoints.

  The device enumerates as a vendor specific USB device with a pair of isochronous
  endpoints (3-OUT and 3-IN).  The application loops back any data that it
  receives on the isochronous OUT endpoint on the isochronous IN endpoint.

  The mult settings is enabled only for USB SS and USB HS operations.
  USB FS functions with a smaller EP size and single packet per microframe.

  The loopback is achieved with the help of a DMA AUTO channel which is
  created connecting the two endpoints.  There is no FX3 CPU involvement
  in the data transfer, and the loopback is performed automatically by the
  FX3 device hardware.

  Files:

    * cyfx_gcc_startup.S : Start-up code for the ARM-9 core on the FX3 device.
      This assembly source file follows the syntax for the GNU assembler.

    * cyfxisolpauto.h   : Constant definitions for the iso loop application.
      The USB connection speed, numbers and properties of the endpoints etc.
      can be selected through definitions in this file.

    * cyfxisolpdscr.c   : C source file containing the USB descriptors that
      are used by this firmware example. VID and PID is defined in this file.

    * cyfxtx.c           : ThreadX RTOS wrappers and utility functions required
      by the FX3 API library.

    * cyfxisolpauto.c   : Main C source file that implements the iso loopback
      example.

    * makefile           : GNU make compliant build script for compiling this
      example.

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